因此，新疾病正在以空前速度出现。
As a result, new diseases are emerging at an unprecedented rate.
新疾病现正以平均每年一种的空前速度出现。
New diseases are now emerging at the unprecedented rate, on average, of one per year.
在危机前本来连续五年以每年9％的空前速度下降的贫困率又开始扶摇直上。
Poverty – which had been dropping across East Asia at an unprecedented rate of 9 percent a year in the five years before the crisis – started spiraling upwards again.
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